Title of the article

STRUCTURE OF GRAIN BOUNDARIES AND MECHANISM OF STABILIZATION OF THE GRAIN STRUCTURE OF STEELS BY STEP HEATING TO AUSTENIZATION TEMPERATURES

Authors

KUKAREKO Vladimir A., D. Sc. in Phys. and Math., Prof., Head of the Center of Structural Research and Tribo-Mechanical Testing of Materials and Mechanical Engineering Products of Collective Use, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

GRIGORCHIK Aleksandr N., Ph. D. in Eng., Deputy Head of the Center of Structural Research and Tribo-Mechanical Testing of Materials and Mechanical Engineering Products of Collective Use, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

CHICHIN Aleksey N., Process Engineer, OJSC “Minsk Tractor Works”, Minsk, Republic of Belarus

In the section MATERIALS SCIENCE IN MECHANICAL ENGINEERING
Year 2020 Issue 1 Pages 45–54
Type of article RAR Index UDK 621.785.52 Index BBK  
Abstract

An analysis of the existing information on the structural state of grain boundaries in metals and the effect of impurities on grain growth during high-temperature heating is carried out. It is established that the heating rate in the interval of phase α→γ transformation has a great influence on the kinetics of growth of austenitic grain. Based on experimental and published data, a model is proposed that describes the mechanism of formation and growth of austenitic grains in steels upon heating at different speeds. It is concluded that slow heating of steel in the interval of phase α→γ transformation leads to the formation of grains with predominantly high-angle misorientation and adsorption at the boundaries of impurity atoms, which contributes to the stabilization of the grain structure.

Keywords

grain boundaries, structure, impurity atoms, growth of austenitic grain, step heating

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